Magnetic force based on size/mass?

Hi all!

I am currently trying to get a “magnetic force” effect - based on the size of an object. I am using applyforce function and have the basic effect working.

My question is - say I have 2 “magnet objects” and another object that the magnets "attract/pull. Right now I have the object being pulled by both of the magnets at the same “strength,” how could I get a stronger pull if one of the magnets happened to be larger in size?

Another example: If I have one magnet at the top of the screen, a larger magnet at the bottom of the screen, and the object to attract in the center of the screen…currently this object basically stays in place because both magnets are pulling with the same “force.” How would the bottom magnet pull with a stronger force (because it is larger)…while still allowing the top magnet to pull with some force?

Thank you!

h1d